<?phpnamespace app\common\model;use think\Model;/** * 配置模型 */class Userchildren extends Model{    protected $name = 'user_children';    public function member()    {        return $this->belongsTo(User::class, 'user_id', 'id');    }    public function child()    {        return $this->belongsTo(User::class, 'children_id', 'id');    }}